生物炭辅助固化土强度性质的研究进展

doi:10.11896/cldb.25040059

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Abstract As an eco-friendly carbon-rich material, biochar has demonstrated potential for improving the performance of concrete and soil. However, its influence pattern and underlying mechanisms on the strength of cement/lime-based stabilized soil when used as an auxiliary material remain inadequately understood, necessitating systematic investigation. This study defined strength index (SI)— the ratio of the unconfined compressive strength of biochar-amended stabilized soil to that of the control stabilized soil — as the key evaluation metric. Utilizing this index, the study analyzed the comprehensive influence of biochar properties, soil types, biochar dosage, and curing age, thereby revealing its microscopic mechanism. The results show that biochar derived from fine-grained wood or agricultural waste, characterized by rich pore structure and strong adsorption capacity, yielded superior strength enhancement. For clay soil with high water content, biochar can regulate water content, promote binder hydration, and fill soil pores. Therefore, higher dosage of biochar amplified strength gain. For soil with low water content, biochar can play a role of internal curing, but its effectiveness is limited and required identification of an optimal dosage threshold. Strength improvements intensified with curing age, and SI achieved an increase of approximately 21% at a 28 d curing age compared to that at 7 d. This paper provides theore-tical substantiation and quantitative evidence for understanding the strengthening mechanisms of biochar in soil stabilization. Future studies need to deepen investigations into the interaction mechanisms within the biochar-binder-soil-water system and broaden durability assessments under complex stress states (static/dynamic) and complex environments (e.g., wet-dry cycles or corrosive attack).

Key words： biochar solidified soil admixture strength index influencing factor

Published: 10 March 2026 Online: 2026-03-10

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TU42

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	Articles by authors
	HE Jun
	ZUO Ziwei
	SUN Siqin
	KANG Duoyun
	YANG Xinyu
	HU Xiaohui

Cite this article:

HE Jun,ZUO Ziwei,SUN Siqin, et al. Research Development on Strength Properties of Solidified Soil with Biochar as Admixture[J]. Materials Reports, 2026, 40(5): 25040059-8.

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https://www.mater-rep.com/EN/10.11896/cldb.25040059 OR https://www.mater-rep.com/EN/Y2026/V40/I5/25040059

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